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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b50623e5db
Protected virtualization guests have to use shared pages for airq notifier bit vectors, because the hypervisor needs to write these bits. Let us make sure we allocate DMA memory for the notifier bit vectors by replacing the kmem_cache with a dma_cache and kalloc() with cio_dma_zalloc(). Signed-off-by: Halil Pasic <pasic@linux.ibm.com> Reviewed-by: Sebastian Ott <sebott@linux.ibm.com> Reviewed-by: Michael Mueller <mimu@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright IBM Corp. 2002, 2007
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* Author(s): Ingo Adlung <adlung@de.ibm.com>
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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* Arnd Bergmann <arndb@de.ibm.com>
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* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#ifndef _ASM_S390_AIRQ_H
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#define _ASM_S390_AIRQ_H
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#include <linux/bit_spinlock.h>
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#include <linux/dma-mapping.h>
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struct airq_struct {
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struct hlist_node list; /* Handler queueing. */
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void (*handler)(struct airq_struct *airq, bool floating);
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u8 *lsi_ptr; /* Local-Summary-Indicator pointer */
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u8 lsi_mask; /* Local-Summary-Indicator mask */
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u8 isc; /* Interrupt-subclass */
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u8 flags;
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};
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#define AIRQ_PTR_ALLOCATED 0x01
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int register_adapter_interrupt(struct airq_struct *airq);
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void unregister_adapter_interrupt(struct airq_struct *airq);
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/* Adapter interrupt bit vector */
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struct airq_iv {
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unsigned long *vector; /* Adapter interrupt bit vector */
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dma_addr_t vector_dma; /* Adapter interrupt bit vector dma */
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unsigned long *avail; /* Allocation bit mask for the bit vector */
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unsigned long *bitlock; /* Lock bit mask for the bit vector */
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unsigned long *ptr; /* Pointer associated with each bit */
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unsigned int *data; /* 32 bit value associated with each bit */
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unsigned long bits; /* Number of bits in the vector */
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unsigned long end; /* Number of highest allocated bit + 1 */
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unsigned long flags; /* Allocation flags */
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spinlock_t lock; /* Lock to protect alloc & free */
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};
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#define AIRQ_IV_ALLOC 1 /* Use an allocation bit mask */
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#define AIRQ_IV_BITLOCK 2 /* Allocate the lock bit mask */
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#define AIRQ_IV_PTR 4 /* Allocate the ptr array */
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#define AIRQ_IV_DATA 8 /* Allocate the data array */
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#define AIRQ_IV_CACHELINE 16 /* Cacheline alignment for the vector */
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struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
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void airq_iv_release(struct airq_iv *iv);
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unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
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void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
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unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
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unsigned long end);
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static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
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{
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return airq_iv_alloc(iv, 1);
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}
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static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
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{
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airq_iv_free(iv, bit, 1);
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}
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static inline unsigned long airq_iv_end(struct airq_iv *iv)
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{
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return iv->end;
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}
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static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
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{
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const unsigned long be_to_le = BITS_PER_LONG - 1;
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bit_spin_lock(bit ^ be_to_le, iv->bitlock);
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}
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static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
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{
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const unsigned long be_to_le = BITS_PER_LONG - 1;
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bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
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}
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static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
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unsigned int data)
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{
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iv->data[bit] = data;
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}
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static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
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unsigned long bit)
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{
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return iv->data[bit];
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}
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static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
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unsigned long ptr)
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{
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iv->ptr[bit] = ptr;
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}
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static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
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unsigned long bit)
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{
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return iv->ptr[bit];
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}
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#endif /* _ASM_S390_AIRQ_H */
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